Do you think I can act as a lender by leaning on another user who escrow and who holds the collateral?
Its gonna be tough but if you want to make a name then try to lend first only to those credible users. Dont ask for collateral, they would definitely not cheated you if they are reputable enough. This is only if you choose your clients or users perfectly. There are plenty whose asking of the loan here on forum might give to people with trusted feedback with known record.